For chitosan in waste water, the chitosan has the ability to handle efficiently with optimal parameters as pH = 7; the amount of chitosan by 3ml (5%); the stirring speed 25 RPM; stirring time 20 minutes. After the glue with the efficient processing of chitosan was 86% opacity, 81.3% SS, 62.2% of COD, 53.1% of the BOD
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